scholarly journals Gradual changes in range size accompany long-term trends in species richness

2017 ◽  
Vol 20 (9) ◽  
pp. 1148-1157 ◽  
Author(s):  
Ryan D. Batt ◽  
James W. Morley ◽  
Rebecca L. Selden ◽  
Morgan W. Tingley ◽  
Malin L. Pinsky
Keyword(s):  
Species Richness ◽  
Range Size ◽  
Long Term Trends

Ecological specialization matters: long-term trends in butterfly species richness and assemblage composition depend on multiple functional traits

2015 ◽  
Vol 21 (7) ◽  
pp. 792-802 ◽  
Author(s):  
Anne Eskildsen ◽  
Luísa G. Carvalheiro ◽  
W. Daniel Kissling ◽  
Jacobus C. Biesmeijer ◽  
Oliver Schweiger ◽  
...  
Keyword(s):  
Species Richness ◽  
Functional Traits ◽  
Butterfly Species ◽  
Ecological Specialization ◽  
Assemblage Composition ◽  
Long Term Trends

Long-Term Trends in Prehistoric Fishing and Hunting on Tobago, West Indies

2006 ◽  
Vol 17 (3) ◽  
pp. 316-334 ◽  
Author(s):  
David W. Steadman ◽  
Sharyn Jones
Keyword(s):  
Species Richness ◽  
Relative Abundance ◽  
West Indies ◽  
Sea Turtles ◽  
Food Preferences ◽  
Reef Fishes ◽  
Archaeological Sites ◽  
Long Term Trends ◽  
The Difference

AbstractWe compare the bone assemblages of Milford 1 (TOB-3) and Golden Grove (TOB-13) in Tobago, West Indies. Milford 1 is a small preceramic occupation (ca. 3000-2800 cal B.P.), whereas Golden Grove is a large ceramic-period village (ca. 1700-900 cal B.P.). Species richness at TOB-13 is greater than at TOB-3, both in marine (67 vs. 39 fishes) and terrestrial (32 vs. 9) taxa. Major shifts in marine exploitation from the preceramic to ceramic periods can be seen in relative abundance of tuna, toadfishes, and in fishes inhabiting mangrove and brackish water environments, and decreases in relative abundance of parrotfish, carnivorous reef fishes, and sea turtles. The abundance of tuna bones at TOB-13 is uniquely high among West Indian archaeological sites. For terrestrial taxa, the difference in species richness exceeds the expected, including decreased specialization on big game (peccaries) at TOB-13, with a greater tendency to hunt reptiles, birds, and mammals of all sizes at TOB-3. Factors underlying the shifts in fishing and hunting may include different collection methods and food preferences of non-Arawakan (preceramic) vs. Arawakan (ceramic) peoples, as well as human-induced declines in populations of peccaries, sea turtles, and selected fish species. Another possible factor is site setting, with the inhabitants of TOB-13 having enhanced access to mangrove habitats.

scholarly journals Long-term trends in helminth infections of wood mice (Apodemus sylvaticus) from the vicinity of Malham Tarn in North Yorkshire, England

Parasitology ◽  
2020 ◽  
pp. 1-13
Author(s):  
Jerzy M. Behnke ◽  
Michael T. Rogan ◽  
Philip S. Craig ◽  
Joseph A. Jackson ◽  
Geoff Hide
Keyword(s):  
Species Richness ◽  
Wood Mouse ◽  
Heligmosomoides Polygyrus ◽  
Mouse Population ◽  
Wood Mice ◽  
Higher Taxa ◽  
Helminth Infections ◽  
Underlying Causes ◽  
Long Term Trends

Abstract Helminth infections in wood mice (n = 483), trapped over a period of 26 years in the woods surrounding Malham Tarn in North Yorkshire, were analysed. Although 10 species of helminths were identified, the overall mean species richness was 1.01 species/mouse indicating that the helminth community was relatively depauperate in this wood mouse population. The dominant species was Heligmosomoides polygyrus, the prevalence (64.6%) and abundance (10.4 worms/mouse) of which declined significantly over the study period. Because of the dominance of this species, analyses of higher taxa (combined helminths and combined nematodes) also revealed significantly declining values for prevalence, although not abundance. Helminth species richness (HSR) and Brillouin's index of diversity (BID) did not show covariance with year, neither did those remaining species whose overall prevalence exceeded 5% (Syphacia stroma, Aonchotheca murissylvatici and Plagiorchis muris). Significant age effects were detected for the prevalence and abundance of all higher taxa, H. polygyrus and P. muris, and for HSR and BID, reflecting the accumulation of helminths with increasing host age. Only two cases of sex bias were found; male bias in abundance of P. muris and combined Digenea. We discuss the significance of these results and hypothesize about the underlying causes.

Commercial trawling in seagrass beds: bycatch and long-term trends in effort of a major shrimp fishery

2014 ◽  
Vol 513 ◽  
pp. 143-153 ◽  
Author(s):  
CD Stallings ◽  
JP Brower ◽  
JM Heinlein Loch ◽  
A Mickle
Keyword(s):  
Seagrass Beds ◽  
Shrimp Fishery ◽  
Long Term Trends
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