Research Article |
Corresponding author: Edmar Meléndez-Jaramillo ( edjaramillo@uat.edu.mx ) Academic editor: Shinichi Nakahara
© 2024 Edmar Meléndez-Jaramillo, Laura Sánchez-Castillo, Juana María Coronado-Blanco, Ma. Teresa de Jesús Segura-Martínez, César Martín Cantú-Ayala.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Meléndez-Jaramillo E, Sánchez-Castillo L, Coronado-Blanco JM, Segura-Martínez MTJ, Cantú-Ayala CM (2024) Butterfly community composition along a vegetation gradient in the Sierra Chiquita, Mexico. Neotropical Biology and Conservation 19(4): 449-474. https://doi.org/10.3897/neotropical.19.e136190
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This study compares the variation of richness, abundance, and diversity of butterfly species for vegetation communities along an elevational gradient and during different seasons in the Priority Region for Conservation of Biodiversity, Sierra Chiquita, located in the northeast of Mexico. We also analyze the influence of environmental variables on the abundance and richness of butterfly species. Seven sampling sites were established based on criteria of vegetation distribution per altitudinal gradient. Sampling was on a monthly basis and carried out in six permanent plots at each site, using an aerial entomological net during November 2015 to October 2016. A total of 38,011 specimens, representing six families and 195 species, were collected. All parameter values showed significant differences across sites, except between thorn forest and gallery forest. Seasonality effect was absent on richness and diversity species; however, for species abundance, the differences between dry season and rainy season were significantly different in each site except for the comparison of thorn forest and gallery forest. The association between the environmental variables and butterfly communities in the elevational gradient was significant, being the dew point, the solar radiation, the canopy leaf area, and the number of flowering plants the most important variables. The present work represents an important contribution of the vegetation communities variation in richness, abundance, and diversity of butterflies in the northeast of Mexico. These results highlight the importance of the conservation of this heterogeneous habitat and establish reference data for the diurnal Lepidoptera fauna of the region.
En este estudio se compara la variación de la riqueza, abundancia y diversidad de especies de mariposas para comunidades vegetales a lo largo de un gradiente altitudinal y durante diferentes estaciones del año en la Región Prioritaria para la Conservación de la Biodiversidad Sierra Chiquita, ubicada en el noreste de México. Asimismo, se analiza la influencia de las variables ambientales en la abundancia y riqueza de especies de mariposas. Se establecieron siete sitios de muestreo con base en criterios de distribución de la vegetación por gradiente altitudinal. Los muestreos fueron mensuales y se llevaron a cabo en seis parcelas permanentes de cada sitio, utilizando una red entomológica aérea durante noviembre de 2015 a octubre de 2016. Se recolectaron un total de 38,011 especímenes pertenecientes a seis familias y 195 especies. Todos los valores de los parámetros fueron significativamente diferentes entre todos los sitios, excepto para la comparación entre bosque espinoso y bosque de galería. El efecto de la estacionalidad estuvo ausente sobre la riqueza y diversidad de especies; sin embargo, para la abundancia de especies las diferencias entre la época seca y la época de lluvias fueron significativamente diferentes en cada sitio, excepto para la comparación entre bosque espinoso y bosque de galería. La asociación entre las variables ambientales y las comunidades de mariposas en el gradiente altitudinal fue significativa, siendo el punto de rocío, la radiación solar, el área foliar del dosel y el número de plantas con flores las variables más importantes. El presente trabajo representa una importante contribución de la variación de las comunidades vegetales en la riqueza, abundancia y diversidad de mariposas en el noreste de México. Estos resultados resaltan la importancia de la conservación de este hábitat heterogéneo y establecen datos de referencia para la lepidóptera diurna de la región.
Community patterns, Papilionoidea, priority land region, seasonality, Tamaulipas, vegetation communities
Butterflies belong to the superfamily Papilionoidea, with 18,768 species worldwide (
Numerous studies show the close association between altitude and changes in species composition and diversity (
In Mexico, several checklists of butterflies from altitudinal transects ranging from 600 to 3,100 m asl, including different vegetation types, have been published (
In this context, the Sierra Chiquita, which is an isolated orographic unit within the coastal plain of the North Gulf of Mexico (
The Sierra Chiquita is located in the central-western portion of the State of Tamaulipas, between 24°23.03' and 24°51.60'N, and 98°32.40' and 99°12.04'W (Fig.
The sampling sites were selected based on
Vegetation | Elevation | Frequent species | General description |
---|---|---|---|
Thorn forest (TF) | 460 m asl | Colubrina elliptica, Ebenopsis ebano, Phyllostylon brasiliense, Randia aculeata, Sideroxylon celastrinum, Yucca treculeana, Zanthoxylum fagara and Ziziphus obtusifolia. | Is a low-strata community, dominated by thorny trees. Most species in this forest are leafless during long periods during the dry season. Only Ebenopsis ebano, which is a dominant species, is left without leaves for a very short period. |
Tamaulipan thornscrub (TTS) | 500 m asl | Acacia farnesiana, Acacia rigidula, Castela tortuosa, Cercidium macrum, Condalia hookeri, and Prosopis juliflora. | Shrub or sub-arboreal community formed by the dominance of thorny species, deciduous for a large part of the year, or aphyllous (leafless). |
Submontane scrub (SS) | 550 m asl | Acacia berlandieri, Acacia rigidula, Cordia boissieri, Havardia pallens, Helietta parvifolia and Leucophyllum frutescens. | The physiognomy of this community is provided by the upper shrub layer, whose height varies between 2.5 and 5.0 m and reaches coverage of up to 70%. It is characterized by Helietta parvifolia, an unarmed rutaceae that gives the vegetation a uniform structure, as it is normally the only dominant one. |
Gallery forest (GF) | 730 m asl | Fraxinus greggii, Platanus occidentalis, Populus mexicana, and Salix humboldtiana. | Tree community that develops on the banks of rivers and streams, always under humid conditions. |
Oak forest (OF) | 960 m asl | Arbutus xalapensis, Quercus canbyi, Quercus clivicola, and Quercus virginiana. | These communities are made up of different species of oaks of the Quercus genus. These forests are generally found as a transition between coniferous forests and jungles. |
Oak and pine forest (OPF) | 820 m asl | Arbutus xalapensis, Carya ovata, Persea podadenia, Pinus pseudostrobus, Platanus occidentalis, Prunus serotina, Quercus laceyi, and Quercus rysophylla. | These communities are made up of oaks and, to a somewhat lesser extent, pines. They are evergreen and deciduous trees; flowering and fruiting are variable throughout the year. |
Cloud forest (CF) | 1080 m asl | Abies guatemalensis, Acer saccharum, Carpinus caroliniana, Carya ovata, Crataegus rosei, Ilex rubra, Liquidambar styraciflua, and Ostrya virginiana. | Physiognomically, it is a dense forest that develops in regions of rugged relief and steep slopes; it is common to find it in ravines protected from winds and strong sunshine. |
During October 2015, the analysis of preliminary samples obtained in the study area was carried out. The Clench model was used to calculate the minimum sample size to be used, based on the method and parameters indicated by
Within each plot, we recorded the frequencies of all adult butterflies over a period of 20 minutes. Butterfly sampling was conducted monthly (from November 2015 to October 2016) in each of the plots and in all vegetation types in order to record all possible species. During the sampling, we had permission from the local authorities. We collected butterflies directly using entomological nets following the techniques recommended by
A representative percentage of the collected specimens was mounted according to the described procedure of
The seasons were defined based on the historical data of the monthly total values of temperature and rainfall (average from 2005 to 2014), which were obtained from MODIS images obtained from the GIOVANNI online server and plotted to visually analyze the fluctuation of these parameters. On this basis, two seasons were defined: the dry season (November to April) and the rainy season (May to October) (Fig.
The microenvironmental variables were measured in each plot using a Kestrel 3500 portable weather station, a LX-101A digital luxmeter, and a convex spherical densiometer, simultaneously with the sampling of the butterflies, recording the following variables: maximum wind speed (MWS) and average wind speed (AWS) (obtained during five minutes of exposure), temperature (T), relative humidity (RH), heat index (HI), dew point (DP), evapotranspiration (E), solar radiation (SR), canopy leaf area (CLA), and the number of flowering plants (FP) present during the sampling.
Species richness was measured as the total number of species observed in the study area as well as in each of the sites. Significant differences in the number of species between sites were determined using one-way ANOVA tests in the Statistica 13.3 program (
Abundance differences between sites were calculated with a one-way ANOVA test. For the analysis of alpha diversity, we adopted the index of Simpson and the analytical method of
The seasonal effect was measured separately, comparing the species richness, abundance, and diversity observed per study site during the dry season (November 2015 to April 2016) and rainy season (May to October 2016). The indexes and statistical tests mentioned above were used for such comparisons: one-way ANOVA tests for differences in species richness and abundance, estimation of species richness, and alpha diversity index, which were performed in Statistica 13.3 and R 3.5.3. In addition, two-way PERMANOVA and NMDS analyses were carried out to include the seasonal effect in the species composition, with the aim of grouping sites and seasons. These analyses were performed in R 3.5.3.
Finally, a canonical correspondence analysis (CCA) was carried out to determine the relationship between the microenvironmental variables and the abundance of the recorded species in each plot, which also includes a Monte Carlo permutation test to evaluate the significance of both the microenvironmental variables as well as the species in the analysis. For the CCA, the average values of the microenvironmental variables of each season of the year were used (dry and rainy season). The CCA was done using the Vegan package in R 3.5.3.
A total of 38,011 Papilionoidea specimens were collected, distributed across six families, 20 subfamilies, 38 tribes, 129 genera, and 195 species. Nymphalidae was the most abundant family, with 15,658 individuals, which represents 41% of the total abundance in the study area. A lower abundance was recorded in Hesperiidae (24%), Pieridae (15%), Lycaenidae (11%), Papilionidae (6%) and Riodinidae (3%). The highest species richness was found in the Nymphalidae family with 33% of the total obtained species, followed by Hesperiidae (29%), Lycaenidae (15%), Pieridae (12%), Papilionidae (6%) and Riodinidae (5%) (Suppl. material
Both abundance and species richness were significantly different (p < 0.05) between all sites, except for the comparison between the sites with TF and GF vegetation (Fig.
Simpson diversity decreased with changes in vegetation with increasing altitudinal gradient and were significantly different (p < 0.05) between all sites, except for the comparison between the sites with TF and GF vegetation (Fig.
In the Sierra Chiquita, the highest abundance and species richness were registered during the rainy season. Both seasons recorded 99.8% inventory completeness.
The differences in the abundance of the dry and rainy seasons were significant (p < 0.05) in each site except for the sites with TF and GF vegetation (Fig.
Two-way PERMANOVA allowed us to identify a significant effect of season (F = 9.287, df = 1, p < 0.001) and plant communities (site) (F = 45.91, df = 6, p < 0.001) on species composition. But the interaction between seasons and plant communities was not significant. Butterflies sampled formed separate groups by plant communities in the NMDS ordination diagram (Stress = 0.1) (Fig.
The HI, DP, SR, CLA, and FP were the significant environmental variables (p < 0.05) used in the CCA (Table
Canonical Correspondence Analysis (CCA) of the butterfly communities and significant environmental variables corresponding to the plant communities sampled. HI = heat index; DP = dew point; SR = solar radiation; CLA = canopy leaf area; FP = number of flowering plants. The meaning of the abbreviations for each species is presented in Suppl. material
Environmental values registered for vegetation community in the Sierra Chiquita. Environmental variables marked (*) are significant (p < 0.05) according to the Monte Carlo permutation test. MWS = maximum wind speed; AWS = average wind speed; T = temperature; RH = relative humidity; HI = heat index; DP = dew point; E = evapotranspiration; SR = solar radiation; CLA = canopy leaf area; FP = number of flowering plants.
Environment variable | TF | TTS | SS | GF | OF | OPF | CF |
---|---|---|---|---|---|---|---|
MWS (Km/h) | 18.1 ± 2.2 | 19.8 ± 1.5 | 21.7 ± 2.7 | 18.9 ± 1.3 | 19.7 ± 1.9 | 20.2 ± 2.1 | 19.9 ± 3 |
AWS (Km/h) | 15.5 ± 2.3 | 17.1 ± 1.5 | 19.4 ± 2.3 | 16.5 ± 1.7 | 17 ± 1.8 | 17.7 ± 1.9 | 17.3 ± 3.1 |
T (°C) | 23.7 ± 1 | 24.7 ± 2 | 24.3 ± 1.6 | 23.7 ± 1.3 | 23.9 ± 1.8 | 23.3 ± 1.2 | 22.9 ± 1.7 |
RH (%) | 64.3 ± 2 | 68.5 ± 1.5 | 66.8 ± 3.2 | 67.1 ± 4.7 | 65.6 ± 1.8 | 66.8 ± 4.4 | 66.5 ± 3.2 |
HI (°C) * | 24.7 ± 1.3 | 25.6 ± 1.7 | 25.3 ± 1.4 | 24.8 ± 1.1 | 24.9 ± 1.9 | 24.3 ± 1.1 | 23.9 ± 1.6 |
DP (°C) * | 16.1 ± 1.3 | 17.2 ± 1.5 | 17.4 ± 2.2 | 16.3 ± 1.5 | 16.6 ± 2.3 | 15.7 ± 1.9 | 15.5 ± 1.8 |
E (°C) | 17.1 ± 1.4 | 18 ± 1.6 | 18.5 ± 2.1 | 17.2 ± 1.7 | 17.6 ± 2.4 | 16.9 ± 1.6 | 16.4 ± 1.9 |
SR (Klux) * | 39.6 ± 5.4 | 39.5 ± 3.9 | 39.4 ± 2.4 | 37.4 ± 3.1 | 36.1 ± 2 | 37.9 ± 3.3 | 35.9 ± 2.2 |
CLA (%) * | 83.7 ± 2.1 | 83.5 ± 4 | 82.6 ± 4.8 | 83.1 ± 3.2 | 82 ± 2 | 80.9 ± 3.4 | 80.7 ± 3.2 |
FP * | 33 ± 5 | 30 ± 7 | 34 ± 9 | 34 ± 8 | 25 ± 7 | 29 ± 10 | 26 ± 4 |
In Sierra Chiquita, the superfamily Papilionoidea consists of 195 species that represent 40% of the richness recorded for Tamaulipas (
When comparing results found in this research with some of the systematic and rigorously sampled inventories of Papilionoidea in Mexico, it can be observed that the species richness in the present study area is high.
Although Van Someren Rydon traps were not used as instruments to increase sampling efficiency in this study, richness estimators suggest that the butterfly fauna was obtained almost entirely in Sierra Chiquita; however, the possibility exists that some species may remain unregistered. In this regard, several authors point out that the increase in number of samples and time of study, or selection of other sampling methods, can aid in complementing faunistic inventories (
Comparing the number of species between different habitats is often enough to give a rapid assessment of a biodiversity measure. However, it is necessary to resort to the use of other statistical measures to make comparisons with other studies (
Altitude is a variable frequently related to changes in species richness and abundance (
The variation found in community patterns could have its origin in abiotic factors that modify along the altitudinal gradient, such as solar radiation and precipitation, as well as the increase of unfavorable environments and the reduction in availability of resources (
According to the behavior of the ecological parameters, abundance, species richness, and diversity in the different sites, it can be suggested that vegetation and perhaps temperature and humidity are the determining factors in the composition of butterfly species in the study area, parameters that decrease with altitude. Protecting populations of Papilionoidea in mountain areas often depends on the conservation of lower adjacent areas, where the greatest abundance may occur (
Seasonality is a very important factor in species distribution, being of great relevance for insects since they cannot regulate their body temperature and therefore require favorable environmental conditions to perform their metabolic activities and development of their life cycles (
Additionally, butterflies are closely associated with plants, and their presence depends on the flora and structure of the vegetation (
On the contrary, the highest variation in temperature as well as the highest number of clear days occur during the months of November to April, leading to high evaporation rates. Under these conditions, most of the vegetation is dry, especially some herbaceous plants that, when flowering, provide food for imagoes. During the drought period, water reserves of tree and shrub species are also reduced, modifying their growth, nectar production, nutritional content, or even texture and turgor of leaves, which constitute food resources for most lepidoptera species. Therefore, although trees and shrubs are present in the habitat, many of them cannot be used by butterflies during this period due to their deciduous phenology, affecting in this way the community composition and populations of butterflies in these months. In addition, some compounds present in plants can vary in each season and not be palatable in certain months, so they are not nutritious for the immature stages of many species. Nevertheless, it is possible that the species is in diapause during the cold months (
Some studies on butterfly ecology have sought to analyze the variables that determine the faunal composition of the communities of this group, including host plants (
The CCA constitutes a measure for the study of environmental gradients and for the analysis of habitable spaces (
In relation to the above, it has been pointed out that the presence of a species in a site is due to three limitations (
Therefore, in this study only ten environmental variables were considered that were measured at the microhabitat level and that correspond to the previously mentioned niche approach, the most important being HI, DP, SR, CLA, and FP.
For the first time in north-eastern Mexico, butterflies were systematically sampled to monitor the plant communities along an elevation gradient of a Priority Region for Conservation of Biodiversity. A total of 38,011 specimens belonging to six families, 20 subfamilies, 38 tribes, 129 genera, and 195 species of butterfly were collected from the study area. The highest abundance and richness of species, as well as alpha diversity, were recorded in the lowest elevation sites and decreased significantly with increasing altitude. The tendency of altitudinal distribution of the Papilionoidea butterflies in Sierra Chiquita is well defined to the environmental characteristics of the lower zone, agreeing with the Rapoport rule. The sites of low and intermediate altitude constitute an area of distribution of tropical species, while the site of the third floor forms an independent group of high mountain species.
The seasonality effect was absent on species richness; however, for species abundance, the differences between dry season and rainy season were significant in each site, except for the comparison between sites with TF and GF vegetation. The geographical location of the study area plus the different plant compositions of the sampled sites could be the main reason for the variation found here in the butterfly communities with altitude and season. In addition, relative humidity and temperature can influence the community of Papilionoidea in the study area; however, both abiotic factors directly affect plant composition, which is assumed to be the main factor in determining the composition and abundance of butterfly species.
The association between environmental variables and the community of Papilionoidea along the elevational gradient was significant, with the conditions of HI, DP, SR, CLA, and FP being the variables that best describe the species composition in the Sierra Chiquita. The information presented here provides reference data that allow the comparison of the diversity and richness of Papilionoidea species at a regional and national scale. This information could be used as an initial step to analyze the possible use of butterflies as a biodiversity indicator group in Mexico.
The first author recognizes the great support of Mr. Luis Lauro Meléndez de la Serna, as well as Ph.D. Uriel Jeshua Sánchez Reyes, for their kindness during the development of the collections.
The authors have declared that no competing interests exist.
No ethical statement was reported.
No funding was reported.
EMJ sampling sites selection, fieldwork, butterflies identification, data analysis and document writing; LSC fieldwork, database compilation and document writing; JMCB butterflies identification, database compilation and document writing; MTJSM butterflies identification and completed document review; CMCA data analysis, results interpretation and completed document review.
Edmar Meléndez-Jaramillo https://orcid.org/0000-0001-9054-2572
Laura Sánchez-Castillo https://orcid.org/0000-0002-1028-2449
Juana María Coronado-Blanco https://orcid.org/0000-0002-8387-7734
Ma. Teresa de Jesús Segura-Martínez https://orcid.org/0000-0001-8123-5773
César Martín Cantú-Ayala https://orcid.org/0000-0003-3903-9802
All of the data that support the findings of this study are available in the main text or Supplementary Information.
Sampling data by vegetation type in the Sierra Chiquita, Mexico
Data type: docx
Explanation note: Coordinates at plot center; elevation in meters.
Taxonomic list and abundance of species found by vegetation community in the Sierra Chiquita
Data type: docx
Explanation note: Legend: TF = Thorn forest, TTS = Tamaulipan thornscrub, SS = Submountain scrub, GF = Gallery forest, OF = Oak forest, OPF = Oak and pine forest, CF = Cloud forest. The marked species (*) are significant (p < 0.05) according to the Monte Carlo permutation test.